San Diego Gas & Electric Electrical Service Requirements

San Diego Gas & Electric (SDG&E) administers electrical service connections across its territory in San Diego and southern Orange counties, operating under authority granted by the California Public Utilities Commission (CPUC). The requirements governing new service, service upgrades, and utility interconnection at the SDG&E meter point are distinct from the California Electrical Code (CEC) requirements that govern internal wiring — both frameworks apply simultaneously to any project requiring utility service. Understanding how SDG&E's tariff rules, metering standards, and service entrance specifications interact with state-level permitting is essential for contractors, engineers, and property owners navigating electrical work in SDG&E's service territory.

Definition and scope

SDG&E electrical service requirements define the technical and procedural standards a property owner or licensed electrical contractor must satisfy before the utility will establish, modify, or restore electrical service at a given premises. These requirements appear in SDG&E's Electric Tariff Schedule, filed with and approved by the CPUC, and in the utility's Electric Service Requirements (ESR) manual — a technical document specifying conductor sizing, metering equipment, transformer clearances, service entrance hardware, and coordination procedures.

The ESR manual distinguishes between residential service (typically 120/240V single-phase, up to 400A), small commercial service (120/240V or 120/208V three-phase, up to 800A at a single meter), and large commercial/industrial service (medium-voltage delivery at 4kV, 12kV, or higher, requiring customer-owned transformation). Each service class carries different metering requirements, point-of-delivery specifications, and capacity reservation procedures. Projects that include solar photovoltaic systems, battery energy storage, or EV charging infrastructure trigger additional technical screens under SDG&E's interconnection rules, which are governed separately under CPUC Rule 21.

The scope of SDG&E's service requirements covers the physical infrastructure from the utility's point of common coupling (the transformer or secondary line) to the customer's meter socket. Everything on the customer side of the meter — panel, feeders, branch circuits — falls under the California Electrical Code and state regulatory framework, enforced through local Authority Having Jurisdiction (AHJ) inspections.

This page covers SDG&E service territory only. Pacific Gas & Electric (PG&E) and Southern California Edison (SCE) publish separate service requirement manuals with differing specifications; projects in those territories are not covered here. Municipal utilities such as the Los Angeles Department of Water and Power (LADWP) operate outside CPUC jurisdiction entirely and are also out of scope.

How it works

The process of obtaining or modifying SDG&E electrical service follows a structured sequence:

Pre-application review — The contractor or engineer determines the load requirements and identifies the appropriate service class using SDG&E's ESR manual load calculation tables. Projects at 200A or below on existing infrastructure typically qualify for standard residential processing.
Service application submission — A New Service Request (NSR) is submitted to SDG&E's Construction Services group, including site plans, load data, and contact information for the licensed contractor. SDG&E assigns a project number and a design engineer for projects above a defined complexity threshold.
Utility design and cost estimate — For projects requiring transformer upgrades, secondary extensions, or vault construction, SDG&E produces a design package and a customer-contribution cost estimate under CPUC Rule 15 (Non-Applicant Facilities) or Rule 16 (Extensions of Distribution Lines).
Customer installation — The licensed electrical contractor installs the service entrance equipment — meter socket, service conduit, grounding electrode system — to SDG&E's metering and service entrance specifications. Conductor sizing, conduit material, and weatherhead placement are all prescribed in the ESR manual.
Local permit and inspection — The AHJ (city or county building department) issues an electrical permit and conducts a rough-in and final inspection. SDG&E will not set the meter until a signed-off inspection card or release is provided.
Meter set and energization — Upon confirmation of inspection approval, SDG&E schedules a meter set. For new construction, this typically occurs within 3 to 5 business days of release receipt under standard workloads.

Projects involving distributed energy resources — rooftop solar, battery storage, EV charging at commercial scale — require a parallel California utility interconnection requirements process, which runs concurrently with but separately from the standard NSR workflow.

Common scenarios

Residential panel upgrade (100A to 200A or 400A): The most frequent residential SDG&E service change. The contractor installs a new meter socket rated to 200A or 400A, installs appropriate service entrance conductors per SDG&E Table specifications, and coordinates with the local AHJ for permit and inspection. SDG&E requires a minimum 1-inch conduit stub from the meter enclosure to the main panel, with specific conduit fill and bend-radius rules.

New commercial tenant improvement with increased load: Tenant improvements that push the building's aggregate load above the existing transformer allocation require an NSR with load data. SDG&E evaluates the available capacity on the serving transformer. If capacity is insufficient, a transformer upgrade is designed, and the project timeline extends by 8 to 20 weeks depending on equipment procurement.

Solar PV and battery storage interconnection: A residential customer installing a 10 kW solar-plus-storage system must submit both a standard meter change request (if a new bidirectional meter is required) and a Rule 21 interconnection application. The California net metering electrical impact rules determine the export metering configuration SDG&E applies at the service point.

EV charging infrastructure for multifamily properties: SDG&E's Plug-In Electric Vehicle (PEV) tariffs provide dedicated rate schedules for EV charging at multifamily properties. Service upgrades to support Level 2 charging stations at 50 or more units typically require a new or upgraded transformer, a dedicated meter for charging circuits, and compliance with California EV charging electrical requirements.

Decision boundaries

The critical technical and procedural boundaries that define which SDG&E pathway applies to a given project:

200A threshold: Projects at or below 200A on existing secondary service infrastructure process through SDG&E's standard residential workflow with minimal utility design involvement. Projects above 200A, or any three-phase service, require SDG&E engineering review.
Transformer capacity: If the serving transformer's available capacity is less than the requested load increase, the utility triggers an infrastructure upgrade process under CPUC Rule 15. The customer may be responsible for a portion of the upgrade cost depending on whether the added load is deemed a "non-applicant" benefit.
Metering configuration: Facilities with on-site generation above 10 kW AC require a revenue-grade bidirectional meter installed by SDG&E. Installations below 10 kW on a residential tariff may qualify for a net energy metering (NEM) configuration using SDG&E's existing meter inventory.
Voltage level: Projects requiring more than approximately 1,500 kVA of demand typically cross into medium-voltage (primary) service, where the customer owns and maintains the transformer, switchgear, and secondary distribution. This boundary defines where California's High Voltage Safety Orders (Cal/OSHA Title 8, §2700 series) begin to govern customer-owned equipment.
AHJ vs. SDG&E jurisdiction: SDG&E governs the meter socket, service entrance raceway, and all infrastructure on the utility side of the meter. The AHJ governs everything from the meter socket enclosure toward the load. This boundary is where California electrical panel upgrade requirements intersect with utility specifications. Contractors coordinating work in both zones must satisfy both sets of requirements independently.

Contractors and engineers working across the full California electrical service sector can reference the California Electrical Authority index for cross-utility comparisons and statewide regulatory context.

References

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